As I've already mentioned, it's the labor that's expensive in either time or money since there are pipes behind the drywall that you're going to rip apart. Also some people put tile over their drywall, the very people more likely to buy an expensive Japanese toilet. We're talking a few thousand dollars.
I'm just trying to convey my experiences with bathroom remodeling on my own house. Anyone is free to listen or ignore my advice.
I never said it wasn't a valid idea. It's just a hard and expensive one. You guys will find out once you become home owners in the future. Also a Japanese toilet costs the same as a cheap car. If you haven't already guessed, I wanted one for my bathroom for years now. It's just not practical.
I don't agree, he's raising exactly the sorts of issues many householders would have. Even just the cost and hassle of redecorating/retiling would put most people off.